It is possible that the body temperature measured when there is sweating in the armpits is a little lower than normal, rather than higher. If there is a lot of sweat in the armpit, the heat from the body surface can be taken away by evaporation, which can lower the body temperature. If an axillary thermometer is used to measure the body temperature at this time, some sweat will get on the thermometer, and the sweat may evaporate and take away some of the heat from the thermometer, so that the thermometer reading may deviate from the real body temperature, which is usually low. Therefore, it is recommended that when measuring the body temperature in the armpit, the sweat in the armpit should be wiped away with a towel and then measured, so as to get a more accurate temperature value. At the same time, the thermometer and the armpit should be in contact for at least 5-10 minutes so that the measurement can be more accurate. The general principle is to keep the armpit sweat-free to measure the body temperature.